A sample of Ac-255 originally contained 8.0g. After 720 hours, how much of the original Ac-255 remains? The half-life of the isotope is 10 days. I will mark the Brainiest if your answer is correct.

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atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.